This file is indexed.

/usr/lib/python3/dist-packages/ufw/parser.py is in ufw 0.33-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
#
# parser.py: parser class for ufw
#
# Copyright 2009-2012 Canonical Ltd.
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3,
#    as published by the Free Software Foundation.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#
# Adding New Commands
#
# 1. Create a new UFWCommandFoo object that implements UFWCommand
# 2. Create UFWCommandFoo.parse() to return a UFWParserResponse object
# 3. Create UFWCommandFoo.help() to display help for this command
# 4. Register this command with the parser using:
#    parser.register_command(UFWCommandFoo('foo'))
#
#
# Extending Existing Commands
#
# 1. Register the new command with an existing UFWCommand via
#    register_command(). Eg
#    parser.register_command(UFWCommandNewcommand('new_command'))
# 2. Update UFWCommandExisting.parse() for new_command
# 3. Update UFWCommandExisting.help() for new_command
#

import re
import ufw.util
from ufw.common import UFWError
from ufw.util import debug

class UFWCommand:
    '''Generic class for parser commands.'''
    def __init__(self, type, command):
        self.command = command
        self.types = []
        if type not in self.types:
            self.types.append(type)
        self.type = type

    def parse(self, argv):
        if len(argv) < 1:
            raise ValueError()

        r = UFWParserResponse(argv[0].lower())

        return r

    def help(self, args):
        raise UFWError("UFWCommand.help: need to override")

class UFWCommandRule(UFWCommand):
    '''Class for parsing ufw rule commands'''
    def __init__(self, command):
        type = 'rule'
        UFWCommand.__init__(self, type, command)

    def parse(self, argv):
        action = ""
        rule = ""
        type = ""
        from_type = "any"
        to_type = "any"
        from_service = ""
        to_service = ""
        insert_pos = ""
        logtype = ""
        remove = False

        if len(argv) > 0 and argv[0].lower() == "rule":
            argv.remove(argv[0])

        # TODO: break this out
        if len(argv) > 0:
            if argv[0].lower() == "delete" and len(argv) > 1:
                remove = True
                argv.remove(argv[0])
                rule_num = None
                try:
                    rule_num = int(argv[0])
                except Exception:
                    action = argv[0]

                # return quickly if deleting by rule number
                if rule_num != None:
                    r = UFWParserResponse('delete-%d' % rule_num)
                    return r

            elif argv[0].lower() == "insert":
                if len(argv) < 4:
                    raise ValueError()
                insert_pos = argv[1]

                # Using position '0' adds rule at end, which is potentially
	        # confusing for the end user
                if insert_pos == "0":
                    err_msg = _("Cannot insert rule at position '%s'") % \
                                (insert_pos)
                    raise UFWError(err_msg)

                # strip out 'insert NUM' and parse as normal
                del argv[1]
                del argv[0]

            action = argv[0]

        if action == "":
            action = self.command
            argv.insert(0, action)

        if action != "allow" and action != "deny" and action != "reject" and \
           action != "limit":
            raise ValueError()

        nargs = len(argv)
        if nargs < 2:
            raise ValueError()

        # set/strip
        rule_direction = "in"
        if nargs > 1 and (argv[1].lower() == "in" or \
                          argv[1].lower() == "out"):
            rule_direction = argv[1].lower()

        # strip out direction if not an interface rule
        if nargs > 2 and argv[2] != "on" and (argv[1].lower() == "in" or \
                                              argv[1].lower() == "out"):
            rule_direction = argv[1].lower()
            del argv[1]
            nargs = len(argv)

        # strip out 'on' as in 'allow in on eth0 ...'
        has_interface = False
        if nargs > 1 and (argv.count('in') > 0 or argv.count('out') > 0):
            err_msg = _("Invalid interface clause")

            if argv[1].lower() != "in" and argv[1].lower() != "out":
                raise UFWError(err_msg)
            if nargs < 3 or argv[2].lower() != "on":
                raise UFWError(err_msg)

            del argv[2]
            nargs = len(argv)
            has_interface = True

        log_idx = 0
        if has_interface and nargs > 3 and (argv[3].lower() == "log" or \
                                            argv[3].lower() == 'log-all'):
            log_idx = 3
        elif nargs > 2 and (argv[1].lower() == "log" or \
                           argv[1].lower() == 'log-all'):
            log_idx = 1

        if log_idx > 0:
            logtype = argv[log_idx].lower()
            # strip out 'log' or 'log-all' and parse as normal
            del argv[log_idx]
            nargs = len(argv)

        if "log" in argv:
            err_msg = _("Option 'log' not allowed here")
            raise UFWError(err_msg)

        if "log-all" in argv:
            err_msg = _("Option 'log-all' not allowed here")
            raise UFWError(err_msg)

        if nargs < 2 or nargs > 13:
            raise ValueError()

        rule_action = action
        if logtype != "":
            rule_action += "_" + logtype
        rule = ufw.common.UFWRule(rule_action, "any", "any", \
                                  direction=rule_direction)
        if remove:
            rule.remove = remove
        elif insert_pos != "":
            try:
                rule.set_position(insert_pos)
            except Exception:
                raise
        if nargs == 2:
            # Short form where only app or port/proto is given
            if ufw.applications.valid_profile_name(argv[1]):
                # Check if name collision with /etc/services. If so, use
                # /etc/services instead of application profile
                try:
                    ufw.util.get_services_proto(argv[1])
                except Exception:
                    type = "both"
                    rule.dapp = argv[1]
                    rule.set_port(argv[1], "dst")
            if rule.dapp == "":
                try:
                    (port, proto) = ufw.util.parse_port_proto(argv[1])
                except UFWError:
                    err_msg = _("Bad port")
                    raise UFWError(err_msg)

                if not re.match('^\d([0-9,:]*\d+)*$', port):
                    if ',' in port or ':' in port:
                        err_msg = _("Port ranges must be numeric")
                        raise UFWError(err_msg)
                    to_service = port

                try:
                    rule.set_protocol(proto)
                    rule.set_port(port, "dst")
                    type = "both"
                except UFWError:
                    err_msg = _("Bad port")
                    raise UFWError(err_msg)

            # Don't specify a port with ipv6, esp or ah protocols
            if rule.protocol in [ 'ipv6', 'esp', 'ah' ]:
                err_msg = _("Invalid port with protocol '%s'") % \
                            (rule.protocol)
                raise UFWError(err_msg)
        elif (nargs + 1) % 2 != 0:
            err_msg = _("Wrong number of arguments")
            raise UFWError(err_msg)
        elif not 'from' in argv and not 'to' in argv and not 'in' in argv and \
             not 'out' in argv:
            err_msg = _("Need 'to' or 'from' clause")
            raise UFWError(err_msg)
        else:
            # Full form with PF-style syntax
            keys = [ 'proto', 'from', 'to', 'port', 'app', 'in', 'out' ]

            # quick check
            if argv.count("to") > 1 or \
               argv.count("from") > 1 or \
               argv.count("proto") > 1 or \
               argv.count("port") > 2 or \
               argv.count("in") > 1 or \
               argv.count("out") > 1 or \
               argv.count("app") > 2 or \
               argv.count("app") > 0 and argv.count("proto") > 0:
                err_msg = _("Improper rule syntax")
                raise UFWError(err_msg)

            i = 0
            loc = ""
            for arg in argv:
                if i % 2 != 0 and argv[i] not in keys:
                    err_msg = _("Invalid token '%s'") % (argv[i])
                    raise UFWError(err_msg)
                if arg == "proto":
                    if i+1 < nargs:
                        try:
                            rule.set_protocol(argv[i+1])
                        except Exception:
                            raise
                    else:
                        err_msg = _("Invalid 'proto' clause")
                        raise UFWError(err_msg)
                elif arg == "in" or arg == "out":
                    if i+1 < nargs:
                        try:
                            if arg == "in":
                                rule.set_interface("in", argv[i+1])
                            elif arg == "out":
                                rule.set_interface("out", argv[i+1])
                        except Exception:
                            raise
                    else:
                        err_msg = _("Invalid '%s' clause") % (arg)
                        raise UFWError(err_msg)
                elif arg == "from":
                    if i+1 < nargs:
                        try:
                            faddr = argv[i+1].lower()
                            if faddr == "any":
                                faddr = "0.0.0.0/0"
                                from_type = "any"
                            else:
                                if ufw.util.valid_address(faddr, "6"):
                                    from_type = "v6"
                                else:
                                    from_type = "v4"
                            rule.set_src(faddr)
                        except Exception:
                            raise
                        loc = "src"
                    else:
                        err_msg = _("Invalid 'from' clause")
                        raise UFWError(err_msg)
                elif arg == "to":
                    if i+1 < nargs:
                        try:
                            saddr = argv[i+1].lower()
                            if saddr == "any":
                                saddr = "0.0.0.0/0"
                                to_type = "any"
                            else:
                                if ufw.util.valid_address(saddr, "6"):
                                    to_type = "v6"
                                else:
                                    to_type = "v4"
                            rule.set_dst(saddr)
                        except Exception:
                            raise
                        loc = "dst"
                    else:
                        err_msg = _("Invalid 'to' clause")
                        raise UFWError(err_msg)
                elif arg == "port" or arg == "app":
                    if i+1 < nargs:
                        if loc == "":
                            err_msg = _("Need 'from' or 'to' with '%s'") % \
                                        (arg)
                            raise UFWError(err_msg)

                        tmp = argv[i+1]
                        if arg == "app":
                            if loc == "src":
                                rule.sapp = tmp
                            else:
                                rule.dapp = tmp
                        elif not re.match('^\d([0-9,:]*\d+)*$', tmp):
                            if ',' in tmp or ':' in tmp:
                                err_msg = _("Port ranges must be numeric")
                                raise UFWError(err_msg)

                            if loc == "src":
                                from_service = tmp
                            else:
                                to_service = tmp
                        try:
                            rule.set_port(tmp, loc)
                        except Exception:
                            raise
                    else:
                        err_msg = _("Invalid 'port' clause")
                        raise UFWError(err_msg)
                i += 1

            # Figure out the type of rule (IPv4, IPv6, or both) this is
            if from_type == "any" and to_type == "any":
                type = "both"
            elif from_type != "any" and to_type != "any" and \
                 from_type != to_type:
                err_msg = _("Mixed IP versions for 'from' and 'to'")
                raise UFWError(err_msg)
            elif from_type != "any":
                type = from_type
            elif to_type != "any":
                type = to_type

        # Adjust protocol
        if to_service != "" or from_service != "":
            proto = ""
            if to_service != "":
                try:
                    proto = ufw.util.get_services_proto(to_service)
                except Exception:
                    err_msg = _("Could not find protocol")
                    raise UFWError(err_msg)
            if from_service != "":
                if proto == "any" or proto == "":
                    try:
                        proto = ufw.util.get_services_proto(from_service)
                    except Exception:
                        err_msg = _("Could not find protocol")
                        raise UFWError(err_msg)
                else:
                    try:
                        tmp = ufw.util.get_services_proto(from_service)
                    except Exception:
                        err_msg = _("Could not find protocol")
                        raise UFWError(err_msg)
                    if proto == "any" or proto == tmp:
                        proto = tmp
                    elif tmp == "any":
                        pass
                    else:
                        err_msg = _("Protocol mismatch (from/to)")
                        raise UFWError(err_msg)

            # Verify found proto with specified proto
            if rule.protocol == "any":
                rule.set_protocol(proto)
            elif proto != "any" and rule.protocol != proto:
                err_msg = _("Protocol mismatch with specified protocol %s") % \
                            (rule.protocol)
                raise UFWError(err_msg)

        # Verify protocol not specified with application rule
        if rule and rule.protocol != "any" and \
           (rule.sapp != "" or rule.dapp != ""):
            err_msg = _("Improper rule syntax ('%s' specified with app rule)") \
                        % (rule.protocol)
            raise UFWError(err_msg)

        if rule.protocol == 'ipv6':
            if type == "v6":
                # Can't use protocol ipv6 with v6 addresses
                err_msg = _("Invalid IPv6 address with protocol '%s'") % \
                            (rule.protocol)
                raise UFWError(err_msg)
            elif type == "both":
                debug("Adjusting iptype to 'v4' for protocol '%s'" % \
                      (rule.protocol))
                type = "v4"

            if rule.dport != "any" or rule.sport != "any":
                # Don't specify a port with ipv6, esp, or ah protocol
                err_msg = _("Invalid port with protocol '%s'") % \
                            (rule.protocol)
                raise UFWError(err_msg)

        r = UFWParserResponse(action)
        r.data['type'] = self.type
        r.data['rule'] = rule
        r.data['iptype'] = type

        return r

    def get_command(r):
        '''Get command string for rule'''
        res = r.action

        if (r.dst == "0.0.0.0/0" or r.dst == "::/0") and \
           (r.src == "0.0.0.0/0" or r.src == "::/0") and \
           r.sport == "any" and \
           r.sapp == "" and \
           r.interface_in == "" and \
           r.interface_out == "" and \
           r.dport != "any":
            # Short syntax
            if r.direction == "out":
                res += " %s" % r.direction
            if r.logtype != "":
                res += " %s" % r.logtype
            if r.dapp != "":
                res += " %s" % r.dapp
            else:
                res += " %s" % r.dport
                if r.protocol != "any":
                    res += "/%s" % r.protocol
        else:
            # Full syntax
            if r.interface_in != "":
                res += " in on %s" % r.interface_in
            if r.interface_out != "":
                res += " out on %s" % r.interface_out
            if r.logtype != "":
                res += " %s" % r.logtype

            for i in ['src', 'dst']:
                if i == 'src':
                    loc = r.src
                    port = r.sport
                    app = r.sapp
                    dir = "from"
                else:
                    loc = r.dst
                    port = r.dport
                    app = r.dapp
                    dir = "to"

                if loc == "0.0.0.0/0" or loc == "::/0":
                    loc = "any"
                if loc == "any" and port == "any" and app == "":
                    pass
                else:
                    res += " %s %s" % (dir, loc)
                    if app != "":
                        res += " app %s" % app
                    elif port != "any":
                        res += " port %s" % port

	    # If still haven't added more than action, then we have a very
            # generic rule, so mark it as such.
            if res == r.action:
                res += " to any"

            if r.protocol != "any" and r.dapp == "" and r.sapp == "":
                res += " proto %s" % r.protocol

        return res
    get_command = staticmethod(get_command)


class UFWCommandApp(UFWCommand):
    '''Class for parsing ufw application commands'''
    def __init__(self, command):
        type = 'app'
        UFWCommand.__init__(self, type, command)

    def parse(self, argv):
        '''Parse applications command.'''
        name = ""
        action = ""
        addnew = False

        if argv[0] != "app":
            raise ValueError()
        del argv[0]

        nargs = len(argv)
        action = argv[0].lower()

        if action == "info" or action == "update":
            if nargs >= 3 and argv[1] == "--add-new":
                addnew = True
                argv.remove("--add-new")
                nargs = len(argv)

            if nargs < 2:
                raise ValueError()

            # Handle quoted name with spaces in it by stripping Python's ['...']
            # list as string text.
            name = str(argv[1]).strip("[']")

            if addnew:
                action += "-with-new"

        if action == "list" and nargs != 1:
            raise ValueError()

        if action == "default":
            if nargs < 2:
                raise ValueError()
            if argv[1].lower() == "allow":
                action = "default-allow"
            elif argv[1].lower() == "deny":
                action = "default-deny"
            elif argv[1].lower() == "reject":
                action = "default-reject"
            elif argv[1].lower() == "skip":
                action = "default-skip"
            else:
                raise ValueError()

        r = UFWParserResponse(action)
        r.data['type'] = self.type
        r.data['name'] = name

        return r


class UFWCommandBasic(UFWCommand):
    '''Class for parsing ufw basic commands'''
    def __init__(self, command):
        type = 'basic'
        UFWCommand.__init__(self, type, command)

class UFWCommandDefault(UFWCommand):
    '''Class for parsing ufw default commands'''
    def __init__(self, command):
        type = 'default'
        UFWCommand.__init__(self, type, command)

    def parse(self, argv):
        # Basic sanity check
        if len(argv) < 2:
            raise ValueError()

        # Set the direction
        action = ""
        direction = "incoming"
        if len(argv) > 2:
            if argv[2].lower() != "incoming" and \
               argv[2].lower() != "input" and \
               argv[2].lower() != "output" and \
               argv[2].lower() != "outgoing":
                raise ValueError()
            if argv[2].lower().startswith("in"):
                direction = "incoming"
            elif argv[2].lower().startswith("out"):
                direction = "outgoing"
            else:
                direction = argv[2].lower()

        # Set the policy
        if argv[1].lower() == "deny":
            action = "default-deny"
        elif argv[1].lower() == "allow":
            action = "default-allow"
        elif argv[1].lower() == "reject":
            action = "default-reject"
        else:
            raise ValueError()

        action += "-%s" % (direction)

        return UFWParserResponse(action)

class UFWCommandLogging(UFWCommand):
    '''Class for parsing ufw logging commands'''
    def __init__(self, command):
        type = 'logging'
        UFWCommand.__init__(self, type, command)

    def parse(self, argv):
        action = ""
        if len(argv) < 2:
            raise ValueError()
        elif argv[1].lower() == "off":
            action = "logging-off"
        elif argv[1].lower() == "on" or argv[1].lower() == "low" or \
             argv[1].lower() == "medium" or argv[1].lower() == "high" or \
             argv[1].lower() == "full":
            action = "logging-on"
            if argv[1].lower() != "on":
                action += "_" + argv[1].lower()
        else:
            raise ValueError()

        return UFWParserResponse(action)

class UFWCommandStatus(UFWCommand):
    '''Class for parsing ufw status commands'''
    def __init__(self, command):
        type = 'status'
        UFWCommand.__init__(self, type, command)

    def parse(self, argv):
        r = UFWCommand.parse(self, argv)
        if len(argv) == 1:
            r.action = "status"
        elif len(argv) > 1:
            if argv[1].lower() == "verbose":
                r.action = "status-verbose"
            elif argv[1].lower() == "numbered":
                r.action = "status-numbered"
            else:
                raise ValueError()
        return r

class UFWCommandShow(UFWCommand):
    '''Class for parsing ufw show commands'''
    def __init__(self, command):
        type = 'show'
        UFWCommand.__init__(self, type, command)

    def parse(self, argv):
        action = ""
        if len(argv) == 1:
            raise ValueError()
        elif argv[1].lower() == "raw":
            action = "show-raw"
        elif argv[1].lower() == "before-rules":
            action = "show-before"
        elif argv[1].lower() == "user-rules":
            action = "show-user"
        elif argv[1].lower() == "after-rules":
            action = "show-after"
        elif argv[1].lower() == "logging-rules":
            action = "show-logging"
        elif argv[1].lower() == "builtins":
            action = "show-builtins"
        elif argv[1].lower() == "listening":
            action = "show-listening"
        elif argv[1].lower() == "added":
            action = "show-added"
        else:
            raise ValueError()

        return UFWParserResponse(action)

class UFWParserResponse:
    '''Class for ufw parser response'''
    def __init__(self, action):
        self.action = action.lower()
        self.dryrun = False
        self.force = False
        self.data = {}

    def __str__(self):
        s = "action='%s'" % (self.action)
        for i in list(self.data.keys()):
            s += ",%s='%s'" % (i,self.data[i])
        s += "\n"

        return repr(s)

class UFWParser:
    '''Class for ufw parser'''
    def __init__(self):
        self.commands = {}

    def allowed_command(self, type, cmd):
        '''Return command if it is allowed, otherwise raise an exception'''
        if type.lower() not in list(self.commands.keys()):
            raise ValueError()

        if cmd.lower() not in list(self.commands[type].keys()):
            raise ValueError()

        return cmd.lower()

    def parse_command(self, args):
        '''Parse command. Returns a UFWParserAction'''
        dryrun = False
        if len(args) > 0 and args[0].lower() == "--dry-run":
            dryrun = True
            args.remove(args[0])

        force = False
        if len(args) > 0 and (args[0].lower() == "--force" or \
                              args[0].lower() == "-f"):
            force = True
            args.remove(args[0])

        cmd = ""
        type = ""

        tmp = args[0].lower()
        if len(args) > 1 and tmp in list(self.commands.keys()) and \
            args[1].lower() in list(self.commands[tmp].keys()):
            type = tmp
            cmd = args[1].lower()
        else:
            # Discover the type
            cmd = tmp
            for i in list(self.commands.keys()):
                if cmd in self.commands[i]:
                    type = i
                    break
            if type == "":
                type = 'rule'

        try:
            action = self.allowed_command(type, cmd)
        except Exception:
            err_msg = _("Invalid command '%s'") % (cmd)
            raise
            raise UFWError(err_msg)

        cmd = self.commands[type][action]
        response = cmd.parse(args)
        response.dryrun = dryrun
        response.force = force

        return response

    def register_command(self, c):
        '''Register a command with the parser'''
        if c.command == None or c.command == '':
            # If the command is empty, then use 'type' as command
            key = "%s" % (c.type)
        else:
            key = "%s" % (c.command)

        if c.type not in self.commands:
            self.commands[c.type] = {}
        if key in self.commands[c.type]:
            err_msg = _("Command '%s' already exists") % (key)
            raise UFWError(err_msg)
        self.commands[c.type][key] = c